Add more tests for Proxy with Authorization

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #555 (7612520) into master (fa08d0e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #555      +/-   ##
==========================================
+ Coverage   76.20%   76.21%   +0.01%     
==========================================
  Files         142      142              
  Lines        5597     5600       +3     
  Branches      565      565              
==========================================
+ Hits         4265     4268       +3     
  Misses       1163     1163              
  Partials      169      169              

Impacted Files	Coverage Δ
src/WireMock.Net/RequestBuilders/Request.cs	100.00% <100.00%> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication